Rock crusher



May 31, 1960 A. G. CUSHMAN 2,938,675

ROCK CRUSHER Filed Dec. 16, 1957 2 Sheets-Sheet 1 INVENTOR. ARTHUR G. CUSHMAN AT TORNEYS M y 31, 1960 A. G. CUSHMAN 2,938,675

ROCK CRUSHER Filed Dec. 16, 1957 2 Sheets-Sheet 2 INVENTOR. ARTHUR G. CUSHMAN AT TQRNEY S United States Patent ROCK CRUSHER Arthur G. Cushman, Springfield, Ohio, assignor of onethird to John F. Cushman, Springfield, Ohio Filed Dec. 16, 1957, Ser. No. 702,851

1 Claim. (Cl. 241-147) This invention relates to crushers and particularly to devices for the crushing of rock, stone and similar materials.

The invention contemplates the provision of a crusher having a plurality of crushing compartments from which crushed material is discharged by gravity; to this end the invention provides a plurality of upright converging jaws between which the compartments are formed. Fixed jaws of the compartments are spaced longitudinally and supported by the frame of the crusher while the movable jaws are supported for reciprocable movement and are interposed between the fixed jaws to provide alternate fixed and movable jaws over the length of the device.

The structure of the invention is compact, provides for primary and secondary crushing, utilizes a minimum of space in proportion to its crushing capacity, is relatively light in weight and movable from area to area for use.

A primary object of the invention therefore is to provide a novel crushing device of improved capacity and of relatively small physical dimensions.

An important object of the invention is to provide a crushing device which is of simple and improved construction, composed of a relatively few readily assembled parts constructed to preclude breakage of the same; and which is readily accessible for adjustment or servicing.

The invention will be more fully understood by reference to the following detailed description and accompanying drawings wherein:

Figure l is a perspective view with parts broken away and illustrating the essential components of the structure of the invention;

Figure 2 is a fragmentary view in plan with parts broken away illustrating transmission mechanism for the structure of the invention;

Figure 3 is an elevational view partly in section illustrating a relative arrangement of the fixed and movable jaws together with the discharge openings of the device of the invention;

Figure 4 is a fragmentary perspective view with parts broken away illustrating a portion of the adjusting mechanism of the structure of Figure 3;

Figure 5 is a fragmentary perspective view illustrating a mode of supporting the adjusting mechanism of the device of Figure 3;

Figure 6 is a fragmentary and perspective view of supporting mechanism for the right hand end of the device of Figure 3; and

Figure 7 is a schematic view illustrating one mode of utilizing the device of the invention.

In the drawings where practical corresponding numerals have been used to designate similar parts.

Referring to the drawings and particularly first to Figures l and 2, the numeral 1 designates a rectangular longitudinally extending frame of a crusher having side walls 2, 3 and an end wall 4. The frame at its left hand end supports bearing blocks 5 having ball bearings 6 which support rotatably a driving shaft 7. Shaft 7 carries at either end pulleys 8 adapted for the receipt of V-belts and I 2,938,675. Patented May 31, 1950 arranged to be driven from any convenient source of power, such as an electric motor (not shown).

As most clearly seen in Figure 3 the driving shaft 7 is provided with an eccentric 9 mounted in a connecting member 10 secured by bolts 11 to a jaw support member 12. A spacer 13 is secured by keys 14 to the connecting member 10 and is retained between the jaw support member 12 and the connecting member 10.

The jaw support member 12 extends longitudinally within the frame and reciprocates upon rotation of the driving shaft 7 of the crusher. At the right hand end (Figure 3) the jaw support member 12 is rockably mounted to provide for the reciprocable movement. 'For this purpose an upper V-guide 15 is welded to the underside of the jaw suport member 12 and receives the rocker 16 in the form of a plate, which rocker is itself supported by and toes into a V-guide 17. j I j The Vguide 17 is mounted between and welded to plates 18 on each side of and bearing against the frame. Plates 18 are slidably supported between pairs of angle irons as at 19. Angle irons 19 are welded to the sides of the frame. I 7

As shown in Figure 6, which illustrates one support mounting, plate 18 carries a vertically extending rod 20 welded thereto and which rod at its upper end is threaded to receive a nut 21. Rod 20 also passes through angle irons as at 22, which angle irons are also welded to the frame. Close adjustment of the height of the V-guide 17 is attained by movement of nut 21 which bears against the angle iron at 22 to limit the height of plate 18 and accordingly V-guide 17. This mounting of the rocker 16 permits reciprocable movement of the jaw support member 12. While the plates 18 may be mounted in ways'if desired, such is not necessary since the plates are secured against lateral movement by the V-guide 17; other forms of height adjustment may be employed.

J aw support member or rigid element 12 has secured thereto as by weld or other suitable fastening means longitudinally extending depending rails or girders 23, which are mounted on and rigidly secured to a longitudinally horizontally extending support 24.

Such structural arrangement provides a rigid reciprocable assembly for the support of the movable jaws, of the device. The movable jaws are designated at 25, 26 and are welded or otherwise suitably secured to the jaw support member 12. Movable jaw 25 carries wear plates 27 footed into the jaw and removably mounted thereon by a retainer 28 secured in position by bolts 29. Similarly, Wear plates 30 are secured by retainer plate 31 and bolts 32 on the movable jaw 26. The movable jaws themselves, as shown in Figure 1, are hollow inverted truncated elements.

Referring particularly -to Figure 3, the movable jaws define with the fixed jaws 33, 34, 35 and 36 the crushing compartments 37, 38, 39 and 40, which compartments are open at the top and discharge through apertures in the jaw support member 12 and support plate 24. These apertures may be clearly seen from Figure 3 at 41, 42; 43, 44; 45, 46; 47 and 48.

The fixed jaws are supported from the frame 1 side walls and are supported above the jaw support member 12 which reciprocates therebeneath. Wear plates 49, 50, 51 and 52 are supported on the fixed jaws by countersunk nut-receiving bolts indicated in the drawings by the numeral 53.

Crushing and compartment sizes are controlled by providing the fixed jaws to be adjusted lengthwise of the device. Thus fixed jaw 33 pivoted at 54 is engaged rearwardly by wedge 55, which is movable vertically upon rotation of bolt 56, which bolt threadedly engages a shelf 57 mounted rigidly between the side walls of the identified by similar numbers.

by block 58 which like the shelf 57 is supported from the frame side walls above the jaw support member 12.

In a similarrnannerto the fixed jaw 33 the fixed jaw '36 -is adjustably movable and the same numerals have .beenrutilized to illustrate the adjustedmember.

:Midway of the length of the'frame a crosspiece 59 exitends between the side walls 2, 3 and is supported thereby. indicated at 60 (Figure upstanding flanges 61 of the cross-pieces are retained on the side walls by bolts 62. The cross-piece59 supports blocks 63, 64 between which there is rotatably mounted a rod 65 (Figure 4). Threaded through the rod .65 is an adjustable stay 66 in the form of .a long threaded'bolnwhich at its lower end (Figure 3) is secured to a wedge 67; Fixed jaw 34 is pivoted to thesidewalls as at 68, is engaged rearwardly by th e wedge 67, which is itself backed up by contoured to rod 70 secured between the side walls of the structure in any conventional manner.

The provision for rotation of rod 65 mounting the stay 66 and blocks .69backing the stay permits movement .of .the wedge 67 and adjustment of jaw 68, while the wedge is rigidly supported.

Fixed jaw 35 is mounted for adjustment in a similar manner to that of jaw 34, and corresponding parts are Closures 71 (Figures 2 and .3) protect the adjustment mechanisms from the entry of particles of rock.

Referring now to Figure 7, a mode of using the device of invention is illustrated. Rock to be crushed is passed upwardly on conveyor 72 and the rock falls onto screen 73. That rock which is too large to fall through screen '73 falls .to compartment 37. Rock falling through screen-73 passes to compartment 39 or 40 of the crusher -over screen 74 as the crusher reciprocates; or rock passing through screen 74 also is of sufiicien-t fineness to discharge .overconveyor 75. Belt 76 is arranged to receive lThe crusher preferably is operated such that rock is continuously passing the apertures as at 41, 42. The movable jaws merely approach'the fixed jaws in the reciprocation.

The box-like frame 1 of the crusher provides a simple, rigid, effective support for the crushing jaws and functions to resist the stresses imposed by the crushing action. Provision midway of the frame length for adjustment of the compartment sizes is irnportant to the attainment of secondary crushing, permitting the accomplishment of completely crushed material in one apparatus. 7

It will be understood that this invention is susceptible to modification in order to adapt it to different usages and .block 69, which is received on and rotatable with respect conditions and accordingly, it is desired to comprehend such modifications within this invention as may fall within the scope'of the appended claim.

What is'claimed isz In a crusher, the combination of a longitudinally extending box-like frame having an open top and bottom, fixed crushing jaws supported within and spaced along the frame, a jaw support in the form of a longitudinally extending rigid element passing beneath the fixed crushing jaws lengthwise within the frame, movable crushing jaws fixedly supported on said element extending in the frame upwardly between the said fixed jaws to define with the fixed jaws crushing compartments, said element having apertures therethrough communicable with the crushing compartments, means rockably supporting the said element within the frame at one end of the frame, said means comprising a V-guide secured to the said element fixedly on the underside of the element at one end and another and rigidly supported V-guide below the said first V-guide and a plate toed into the V-guides, a horizontally extending support in the frame beneath the rigid element and having an aperture through which said plate passes freely, a plurality of longitudinal vertically extending and spaced apart rails securing the said support to the rigid element, and means for driving the element, rails and support in reciprocation as a unit, said latter: means comprising a driving shaft at the end of the frame opposite the V-guides, said driving shaft having an eccentrio and a rigid connecting member fixedly supported on the said element and movable with the element securing the element with the eccentric, said horizontally extending support having apertures communicating with the apertures of the said element. i

References Cited in the file of this patent UNITED STATES PATENTS 308,236 Blake Nov. 18, 1884 1,626,535 Hush Apr. 26, 1927 2,264,915 Meister Dec. 2, 1941 

